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Related Experiment Video

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Handwriting Analysis Indicates Spontaneous Dyskinesias in Neuroleptic Naïve Adolescents at High Risk for Psychosis
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Action simulation in hallucination-prone adolescents.

Tarik Dahoun1, Stephan Eliez, Fei Chen

  • 1Office Médico-Pédagogique Research Unit, Department of Psychiatry, University of Geneva School of Medicine Geneva, Switzerland.

Frontiers in Human Neuroscience
|July 13, 2013
PubMed
Summary
This summary is machine-generated.

Adolescents prone to hallucinations show atypical brain activity in self-other discrimination areas. This study reveals similar neural patterns in auditory hallucination (AH) and 22q11.2 deletion syndrome (22q11.2DS) groups, suggesting shared mechanisms for hallucination proneness.

Keywords:
22q11.2action simulationauditory hallucinationsperspective-taking

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Area of Science:

  • Neuroscience
  • Developmental Psychology
  • Psychiatry

Background:

  • Impaired self-other discrimination is linked to hallucinations.
  • Adolescent development of these processes is understudied.
  • Perspective-taking confusion is observed in hallucination-prone individuals.

Purpose of the Study:

  • Delineate neural correlates of mental simulation of self-performed (1PP) vs. other-performed (3PP) actions in adolescents.
  • Identify atypical brain activation in hallucination-prone adolescents during 1PP/3PP simulation.
  • Examine if differential schizophrenia risk (clinical vs. genetic) correlates with distinct simulation impairments.

Main Methods:

  • fMRI task involving mental simulation of actions from first-person (1PP) and third-person (3PP) perspectives.
  • Inclusion of typically developing controls, adolescents with auditory hallucinations (AH), and adolescents with 22q11.2 Deletion Syndrome (22q11.2DS).
  • Assessment of hallucination proneness using the Cardiff Anomalous Perception Scale (CAPS).

Main Results:

  • Atypical cerebral activation in self-other distinction areas observed in both AH and 22q11.2DS groups.
  • AH group showed decreased activation in occipital and cingulate areas for 3PP > 1PP.
  • 22q11.2DS group exhibited decreased activation in occipital, caudate, and precuneus areas for 3PP > 1PP, and for other-related cues compared to controls.

Conclusions:

  • Neural correlates of action mental imagery in adolescence are characterized.
  • Similar atypical activations in self-other discrimination areas are linked to differential hallucination proneness (clinical vs. genetic).
  • Findings offer insights for future research and prevention strategies for adolescent hallucination proneness.